Fixed tab and tab contents frame overlapping when using style sheets

When setting the contents frame layout, the overlapping amount used was the
one from the base style because we were checking the wrong widget. We now
ensure that it's the QTabWidget we are checking for the pane pseudo-element
subrule.

Reviewed-by: Olivier
Task-number: QTBUG-2555

1 files changed, 6 insertions, 2 deletions

diff --git a/src/gui/styles/qstylesheetstyle.cpp b/src/gui/styles/qstylesheetstyle.cpp
index 59210c3..8b40931 100644
--- a/src/gui/styles/qstylesheetstyle.cpp
+++ b/src/gui/styles/qstylesheetstyle.cpp
@@ -4637,6 +4637,7 @@ int QStyleSheetStyle::pixelMetric(PixelMetric m, const QStyleOption *opt, const
         }
         break;
 
+#ifndef QT_NO_TABWIDGET
     case PM_TabBarTabHSpace:
     case PM_TabBarTabVSpace:
         subRule = renderRule(w, opt, PseudoElement_TabBarTab);
@@ -4660,11 +4661,14 @@ int QStyleSheetStyle::pixelMetric(PixelMetric m, const QStyleOption *opt, const
             return 0;
         break;
 
-    case PM_TabBarBaseOverlap:
-        if (hasStyleRule(w->parentWidget(), PseudoElement_TabWidgetPane)) {
+    case PM_TabBarBaseOverlap: {
+        const QWidget *tabWidget = qobject_cast<const QTabWidget *>(w) ? w : w->parentWidget();
+        if (hasStyleRule(tabWidget, PseudoElement_TabWidgetPane)) {
             return 0;
         }
         break;
+    }
+#endif // QT_NO_TABWIDGET
 
     case PM_SliderThickness: // horizontal slider's height (sizeHint)
     case PM_SliderLength: // minimum length of slider